<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	<style type="text/css">
		div{
			width: 24px;
			height: 24px;
			background-image: url(../../src/camera.png);
			background-position: 0px -48px;
		}
		div:hover{
			background-position: 0px -72px;
		}                   /* hover鼠标悬停状态 */
	</style>
	</head>
	<body>
	<div></div>
	</body>
</html>
